diff --git a/sys/netipsec/ipsec.c b/sys/netipsec/ipsec.c
index 7f604ed3d33..65a53c00685 100644
--- a/sys/netipsec/ipsec.c
+++ b/sys/netipsec/ipsec.c
@@ -1843,7 +1843,7 @@ inet_ntoa4(struct in_addr ina)
 char *
 ipsec_address(union sockaddr_union* sa)
 {
-#if INET6
+#ifdef INET6
 	char ip6buf[INET6_ADDRSTRLEN];
 #endif
 	switch (sa->sa.sa_family) {
diff --git a/sys/netipsec/ipsec_input.c b/sys/netipsec/ipsec_input.c
index ef007ef724e..33685602e3f 100644
--- a/sys/netipsec/ipsec_input.c
+++ b/sys/netipsec/ipsec_input.c
@@ -277,7 +277,7 @@ ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav,
 	struct tdb_ident *tdbi;
 	struct secasindex *saidx;
 	int error;
-#if INET6
+#ifdef INET6
 #ifdef notyet
 	char ip6buf[INET6_ADDRSTRLEN];
 #endif